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Crustacea, Isopoda, Anthuridae) from Korea

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Crustacea, Isopoda, Anthuridae) from Korea Anim. Syst. Evol. Divers. Vol. 34, No. 3: 174-180, July 2018 https://doi.org/10.5635/ASED.2018.34.3.174 Short communication A New Report of Anthurid Isopod (Crustacea, Isopoda, Anthuridae) from Korea Sung Hoon Kim1, Seong Myeong Yoon2,* 1Department of Life Sciences, College of Natural Sciences, Chosun University, Gwangju 61452, Korea 2Department of Biology, College of Natural Sciences, Chosun University, Gwangju 61452, Korea ABSTRACT In this study, Caenanthura engimatica (Kensley and Reid, 1984) is newly reported from Korea along with detailed description and illustrations. This species can be characterized by the following features: cephalon has a rostrum extending as long as anterolateral lobes; pereonites 4-6 have shallow middorsal pits; the mandible palp has 2 articles; article 1 of the mandible palp is twice longer than article 2; and the maxillipedal palp has 1-3 fused and 4-5 fused articles. This is the first report of C. engimatica beyond Arabian Gulf, the type locality, and Indian Ocean. Additionally, we proposed a revised key to known species of the genus Caenathura Kensley, 1978. Keywords: Caenanthura, isopod, morphology, taxonomy, Korea INTRODUCTION ular palp has two segmented articles; and the maxilliped is four segmented. However, Wägele (1989) has synonymized The family Anthuridae Leach, 1814 is the oldest and largest Arabanthura with Caenanthura. Thereafter, Poore (2001) group in superfamily Anthuroidea Leach, 1814, including confirmed it based on the morphology of maxilliped and 25 genera (Chew et al., 2014). This can be recognized from pereopod 1. In this study, we newly report a Caenathura other Anthuroid isopods by the following characteristics: the species from Korea, C. engimatica, with detailed description body is 10-15 times as long as wide; the flagellum of the and illustrations. This species was originally described from antenna is fewer than ten articles and shorter than the pe­ the Arabian Gulf by Kensley and Reid (1984). The present duncle; the maxillipedal palp has five free articles or some study is the first report of this species from the other region fused articles; each propodus palm of pereopods 4-7 has beyond the Arabian Gulf and the Indian Ocean (WoRMS, single distal robust seta; the exopod of pleopod 1 is opercu­ 2018). We provide a revised key to known species of the liform; the mouthparts are not produced anteriorly; the ple­ genus Caenanthura in this paper. otelson has two statocysts (Poore, 2009). In this family, the Specimens of Caenanthura engimatica were collected genus Caenathura Kensley, 1978 comprises 6 species, Cae- from the southern coast of Korea using a sieve with mesh nathura siamensis (Barnard, 1925), Caenathura indica Ne­ size of 1 mm and the van Veen grab. The collected materials goescu, 1980, Caenathura engimatica (Kensley and Reid, were immediately fixed in 95% ethanol and transferred to 1984), Caenathura gutui (Negoescu, 1997), Caenathura the laboratory. A stereomicroscope (Olympus SZH­ILLD, ibex Bamber, 2008, and Caenathura koreana Song and Min, Japan) and a bright field microscope (Nikon Eclipse 80i, 2015. They can be distinguished from other anthurid isopods Japan) each equipped with a drawing tube were used to by having one or two mandibular palp articles, two or three observe the habitus and appendages. Measurements and il­ maxillipedal articles, and lacking eye (Barnard, 1925; Kens­ lustrations of the specimens were performed with the aid of ley, 1978; Negoescu, 1980; Kensley and Reid, 1984; Nego­ a drawing tube and camera lucida. Examined specimens in escu, 1997; Bamber, 2008; Song and Min, 2015). Kensley this study were deposited at the National Institute of Biolog­ and Reid (1984) have erected the genus Arabanthura by the ical Resources (NIBR) and Chosun University in Korea. following characteristics: the eyes are absent; the mandib­ This is an Open Access article distributed under the terms of the Creative *To whom correspondence should be addressed Commons Attribution Non­Commercial License (http://creativecommons.org/ Tel: 82-62-230-7018, Fax: 82-62-230-7018 licenses/by­nc/3.0/) which permits unrestricted non­commercial use, distribution, E-mail: [email protected] and reproduction in any medium, provided the original work is properly cited. eISSN 2234-8190 Copyright The Korean Society of Systematic Zoology A New Report of Caenanthura from Korea SYSTEMATIC ACCOUNTS article 2; each article with 1 simple seta distally; molar small and bluntly rounded; incisor with single rounded cusp Order Isopoda Latreille, 1817 on right side and 3 small teeth on left side; lamina dentata Family Anthuridae Leach, 1814 unserrated on both sides (Fig. 2A, B). Genus Caenanthura Kensley, 1978 Maxilla with 1 prominent and 4 smaller spines apically (Fig. 2C). *Caenanthura engimatica (Kensley and Reid, 1984) Maxilliped 4 segmented; endite absent; palp articles 1-3 (Figs. 1-4) fused, with 3 simple setae along with lateral margin and 2 Arabanthura engimatica Kensley and Reid, 1984: 675. long simple setae at distal margin; articles 4-5 fused, with 3 Caenanthura engimatica Poore, 2001: 108. simple setae laterally (Fig. 2D). Pereopod 1 subchelate, robust; basis bulbous, as long as Material examined. Korea: 6♀♀, Jeollanam-do: Wando- width, with 2 plumose setae and 4 simple setae; ischium gun, Soan­myeon, Maengseon­ri (34°10′49″N, 126°38′07″ with simple setae on ventral and dorsal margins; merus with E), 27 May 2017; 1♀, Gyeongsangnam­do: Tongyeong­si, simple setae along with ventral margin and anterodistal Hansan­myeon, Yongho­ri (34°44′44″N, 128°28′07″E), depth angle; carpus triangular, crenulated and produced on pos­ 10 m, van Veen grab, 24 Mar 2014; 2♀♀, Chubong­ri (34° terodistal margin, 1 strong fringed proximal spine and nu­ 45′42″N, 128°32′30″E), depth 8 m, van Veen grab, 19 Mar merous simple setae on ventral margin; propodus swollen; 2014; 1♀, Yeomho­ri (34°48′04″N, 128°26′20″E), 18 Oct palm crenulated and with 1 strong fringed proximal spine 2014; 1♀, Sanyang­eup, Yeongun­ri (34°48′04″N, 128°26′ an numerous simple setae; unguis longer than other pereo­ 20″E), 20 Mar 2014; 2♀♀, Geoje­si, Nambu­myeon, Jeogu­ pods. Pereopod 2 basis subequal in length to ischium; is­ ri (34°43′50″N, 128°35′30″E), depth 10 m, van Veen grab, chium, merus, carpus, and propodus with long simple setae 17 Oct 2014. on ventral margin; ischium and mers with simple setae on Description. Body 9 times as long as wide, slender, and dorsal margin; propodus with 1 short robust spine on plam. smooth; length 9.1 mm. Cephalon 0.9 times longer than Pereopod 3 similar to pereopod 2; basis with 1 plumose width, with rostrum extending as long as anterolateral lobes, seta. Pereopods 4-7 similar to each other; bases with 1 or 2 without eyes. Proportions of body segments: cephalon< plumose setae on dorsal margin; ischia with 1 simple seta on pereonite 1<pereonite 2<pereonite 3<pereonite 4>pere­ dorsal margin and numerous simple setae on ventral margin; onite 5>pereonite 6>pereonite 7<pleon. Pereonites 4-6 meri with 2 simple setae on dorsal margin and numerous with shallow middorsal pits. Pleonites 1-5 fused, indicated simple setae on ventral margin; carpi with 1 simple spine by minute ventral margin; pleonite 6 free, with middorsal and 3-4 simple setae on ventral margin and 1 stout circum­ notch on posterior margin. Pleotelson slightly convex, dor­ plumose spine and 1 simple seta on dorsal margin except for soventrally flattened, lanceolate, with rounded posterior pereopod; propodi with 1 short serrate posterodisatal spine; margin, 2 basal statocysts, 2 pairs of simple setae on dorsal dactyli with fringed margin on ventral margin; unguis very margin, 5 simple setae on distal margin of pleotelson (Fig. small (Fig. 3A-G). 1A-C). Pleopod 1 peduncle with 3 lateral hooks and 1 plumose Antennule with 3 peduncle articles and 1 flagellum con­ seta; rami subequal in length, with long plumose setae api­ sisting of 4 articles; article 1 of peduncle longest, with 1 cally; exopod 2 times wider than endopod. Pleopod 2 pe­ short simple seta and 1 plumose seta; article 2 with 1 long duncle with 1 plumose seta on inner margin; rami with long simple seta, 2 short simple setae, and 1 plumose seta; arti­ plumose setae on apical end; endopod slightly longer than cle 3 with 2 long simple setae, 1 short simple seta, and, 1 exopod; exopod with 2 short plumose setae laterally. Pleop­ plumose seta; flagellum article 4 with 3 aesthetascs and 2 ods 3-5 peduncles with 2 plumose setae on both sides; rami simple setae (Fig. 1D). subequal in length, with long plumose setae apically; exo­ Antenna with 5 peduncle articles and 1 flagellum com­ pod with 2 short plumose setae on lateral margin. Pleopod posed of single article; peduncle article 2 longest, grooved 5 smallest; exopod with 1 plumose seta laterally; rami with to accommodate antennule; each peduncle article 2 and 4 plumose setae on apical margin (Fig. 4A-E). with 2 simple setae distally; peduncle article 5 with 5 sim­ Uropodal sympod rectangular, longer than width, with 1 ple setae and 2 short simple setae; single article of flagellum plumose seta on each lateral margins; endopod longer than with several apical setae (Fig. 1E). exopod, with acute distal margin and numerous distal setae Mandible palp with 2 articles; article 1 twice longer than on distal margin; exopod elongated oval shape, with sinuous Korean name: *등홈무목마디벌레 (신칭) Anim. Syst. Evol. Divers. 34(3), 174-180 175 Sung Hoon Kim, Seong Myeong Yoon A B C D A, B C D, E E Fig. 1. Caenanthura engimatica, female. A, Habitus, dorsal view; B, Habitus, lateral view; C, Pleotelson; D, Antennule; E, Antenna. Scale bars: A-C=1 mm, D, E=0.2 mm.
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